WSU Extension > Mason County > Loading view. There were no results found. There were no results found. Events Belfair State Park Belfair State Park 3151 WA-300 Belfair, WA 98528 United States Get Directions (360) 275-0668 https://www.parks.wa.gov/475/Belfair Today Upcoming Upcoming Select date. Previous Events Today Next Events Subscribe to calendar Google Calendar iCalendar Outlook 365 Outlook Live Export .ics file Export Outlook .ics file